{"product_id":"vivo-x50-pro-replacement-battery-387v-4200mah-li-polymer","title":"Vivo X50 Pro B-N3 Replacement Battery 3.87V 4200mAh","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eVivo X50 Pro \/ X51 5G — 3.87V Li-Polymer Replacement Battery (B-N3)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThe B-N3 is the OEM-matched Li-Polymer cell for the Vivo X50 Pro, X50 Pro 5G, X51 5G, and V2005. It runs at 3.87V with a 4200mAh (16.25Wh) capacity — the same electrical spec as the original cell. Fits the standard connector and sits within the original battery bay dimensions of 76.70 × 62.45 × 4.60mm.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eX50 Pro and X51 5G platform compatibility:\u003c\/strong\u003e\n    Both devices share the same battery bay dimensions, voltage rail, and BMS handshake protocol, which is why a single B-N3 cell covers the full lineup. The connector pinout and charge IC communication are identical across V2005 and the 5G variants.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through full charge and discharge on an X50 Pro unit. The BMS accepted the cell without error flags, charge IC communication stayed stable throughout, and voltage held steady under screen and modem load.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFuel gauge recalibration on first cycle:\u003c\/strong\u003e\n    On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map its coulomb counter to the new cell's discharge curve before high-current charging pushes current into an uncalibrated state.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eSudden shutdown at 20–30% on the X50 Pro after a cell swap\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eA new cell has a slightly different voltage-versus-capacity curve than the worn cell the fuel gauge IC was calibrated against. When the phone hits the old cell's low-voltage cliff — around 3.5V under modem or display load — the BMS cuts power even though usable capacity remains. The fuel gauge reports 20–30% because it's reading a curve that no longer matches the new cell. One full slow discharge to shutdown followed by a complete charge to 100% resets the coulomb counter to the correct curve.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eUSB-PD fast charge not activating on the first cycle after replacement\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThe X50 Pro's charge IC uses a handshake with the BMS to confirm cell state before enabling high-current fast charge. On a freshly installed cell with no charge history, the BMS reports an unknown state and the charge IC defaults to standard 5V input as a protection measure. This is not a fault — it clears after the first complete charge cycle. Connect to the original Vivo charger, let it complete a full charge to 100%, and fast charge will activate from the second cycle onward.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43391883968602,"sku":"BWCS-BKX510SL-1","price":26.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43391884001370,"sku":"BWCS-BKX510SL-2","price":29.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43391884034138,"sku":"BWCS-BKX510SL-3","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-BKX510SL-1.webp?v=1779142540","url":"https:\/\/batteryweb.com\/products\/vivo-x50-pro-replacement-battery-387v-4200mah-li-polymer","provider":"BatteryWeb","version":"1.0","type":"link"}